/*
 *  Copyright 2008-2010 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#pragma once

#include <thrust/iterator/counting_iterator.h>
#include <thrust/iterator/iterator_adaptor.h>

namespace thrust {

// forward declaration of constant_iterator
template<typename, typename, typename> class constant_iterator;

namespace detail {

template < typename Value,
         typename Incrementable,
         typename Space >
struct constant_iterator_base {
    typedef Value              value_type;

    // the reference type is just a const reference to the value_type
    typedef const value_type& reference;
    typedef const value_type* pointer;

    // the incrementable type is int unless otherwise specified
    typedef typename thrust::experimental::detail::ia_dflt_help <
    Incrementable,
    thrust::detail::identity_<int>
    >::type incrementable;

    typedef typename thrust::counting_iterator <
    incrementable,
    Space,
    thrust::random_access_traversal_tag
    > base_iterator;

    typedef typename thrust::experimental::iterator_adaptor <
    constant_iterator<Value, Incrementable, Space>,
                      base_iterator,
                      pointer,
                      value_type,
                      typename thrust::iterator_space<base_iterator>::type,
                      typename thrust::iterator_traversal<base_iterator>::type,
                      reference
                      > type;
}; // end constant_iterator_base

} // end detail

} // end thrust

